I use J223, and I have to blast my 8oz jars with a heat gun IF I pour a little hot. Last night I made Creme Brulee and Cinnamon Buns, and this morning I had no sink holes in either one. Interesting enough, I poured at 150 like always. The only difference is I got the wax from a different supplier this time. HMMM....doubt that has anything to do with it, but for some reason I had no sink holes. Normally, though, I do, and I use the heat gun. This isn't a big deal to me, but for some it might be:)